Time for a baseball post: Robin Roberts and his dopplegangers

Robin Roberts, the great Phillies pitcher of the 1950s, died today at age 83, Joe Posnanski has written a moving portrait of him, which is well worth your time. What I'm here to tell you about is Robin Roberts and his dopplegangers--two pitchers, one from (mostly) the 1960s/70s and one from (mostly) the 1970s/80s. These three pitchers have stunningly similar career statistics, so similar that they are almost impossible to tell apart. One was born in Zeeland, Michigan, the other in Zeist, The Netherlands. (Roberts, more prosaically, came from Springfield, Illinois.)
Robin Roberts, Jim Kaat, and Bert Blyleven.

Here's the data:

....................Roberts..........Kaat.............Blyleven
W...................286...............283.................287
L....................245...............237..................250
W-L%.........0.539.............0.544..............0.534
ERA..............3.41...............3.45................3.31
G....................676...............898.................692
GS..................609..............625.................685
GF...................49...............102.....................3
CG.................305...............180.................242
SHO.................45.................31..................60
SV....................25.................18.....................0
IP.................4688.2..........4530.1.............4970
H..................4582.............4620................4632
R..................1962.............2038................2029
ER................1774.............1738................1830
HR................*505*..............395..................430
BB..................902.............1083................1322
IBB...................69...............116....................71
SO................2357.............2461................3701
HBP..................54...............122..................155
BK......................3....................6...................19
WP...................33................128.................114
BF..............19,174...........19,023............20,491
ERA+..............113................108.................118
WHIP.............1.17...............1.26................1.20
H/9..................8.8.................9.2...................8.4
HR/9...............1.0.................0.8....................0.8
BB/9................1.7.................2.2....................2.4
SO/9................4.5................4.9....................6.7
SO/BB.............2.6.................2.3...................2.8

I am, perhaps, most amazed by Roberts' being charged with only 33 wild pitches in his career (although there's a lot of scorer discretion there; it'd be interesting to check their catchers' passed balls). Roberts also, and rather famously, gave up a lot of homers--but so did Kaat and Blyleven. Bert, obviously, was more of a strike-out pitcher.

For all the similarity in their statistics, they really weren't all that similar as pitchers. Roberts was almost entirely a fastball pitcher; Kaat came up as a power pitcher, but for most of his career changed speeds and moved the ball around (and, late in his career, developed a knuckler); Blyleven, or course, was famed for his curve. Roberts was 6'0", 190; Kaat, 6'4", 205; Blyleven, 6'3", 200. Roberts attended Michigan State; Kaat, Hope College (in Michigan); Blyleven signed out of high school, from California.

Roberts, of course, is in baseball's Hall of Fame. Kaat and Blyleven are not.