About 30 players moved east to west, last year to this year, and similar number the other way. Not much difference in their net performances:
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moved    min.   e484   PER   WS/48   BPM
W to E  19278   .75   13.5   .087   -1.1
E to W  18342   .76   13.1   .092   -0.8
Numbers as of a week ago.
West to East: Lillard, Schroder, Beasley, Tyus Jones, Poole, DiVincenzo, Bruce Brown have played 1000 minutes.
East to West: VanVleet, Harden, Grayson Allen, J Collins, D Jones, G Williams, Brogdon, Beal, Osman...
A more likely source of "western improvement" might be the rookie crop. This thread claims West rookies lead East 46-17 in projected wins added.
https://www.apbr.org/metrics/viewtopic.php?t=10044
Another phenomenon is improved health by a lot of major players, and the advantage is again in the West.
https://www.apbr.org/metrics/viewtopic. ... 160#p41160
Showing current minutes and extrapolated to 82 team games; avg minutes over previous 3 and 5 years.
x/yz is '24? divided by avg of other two -- prev3 get more weight than 4-5 years ago.
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x/yz    player    tm    min   '24?     pr3    pr5
2.15   Thompson  GSW   1060   2414    1073   1174
2.02   Zion      NOP    907   2010     994   
1.93   M Porter  Den   1182   2551    1325   
1.89   Kawhi     LAC   1103   2512    1174   1482
1.82   J Jackson Mem   1138   2592    1390   1462
1.76   A Davis   LAL   1262   2797    1490   1690
1.73   Nurkic    Phx    974   2159    1283   1215
1.57   Durant    Phx   1110   2460    1625   1516
1.56   George    LAC   1173   2672    1612   1819
1.50   Towns     Min   1111   2603    1707   1771
x/yz    player    tm    min   '24?     pr3    pr5
1.38   M Turner  Ind    969   2207    1505   1692
1.37   LeBron    LAL   1175   2604    1847   1959
1.36   Ingram    NOP   1137   2520    1833   1873
1.34   Giannis   Mil   1268   2810    2080   2103
1.34   Curry     GSW   1135   2585    2101   1755
1.33   Lillard   Mil   1205   2671    1854   2175
The top 10 and all but 3 of these are in the West!
Translated to eWins added beyond last season:
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eW+    West             eW+     East
6.5   Karl-A Towns      4.4   Cade Cunningham
5.0   Anthony Davis     4.0   Giannis
4.6   Zion Williamson   3.2   Tyrese Maxey
3.5   Kevin Durant      3.2   Goga Bitadze
3.2   Brandon Ingram    2.8   Duncan Robinson
3.1   Nikola Jokić      2.7   Coby White
3.0   LeBron James      2.4   Khris Middleton
2.9   Kawhi Leonard     2.1   Day'Ron Sharpe
2.9   Collin Sexton     2.0   Andre Drummond
2.6   Jusuf Nurkić      1.8   Damian Lillard
2.5   Paul George       1.8   Obi Toppin
2.4   Desmond Bane      1.8   Payton Pritchard
2.3   Dario Šarić       1.8   Cam Thomas
2.2   Michael Porter   34.0   total East   
2.1   Devin Vassell         
2.1   Shai         
2.0   Jaren Jackson         
1.8   Stephen Curry         
54.7  total West          
A few are added to the previous list based on actual improvement, as well as more minutes.
These aren't 'total' totals but just those projecting to have at least 1.8 eWins more than last year; as of a couple weeks ago.