They don't need it but you could still likely use the T2 transformer in those cabinets. The additional 24.5V output intended to drive T2's gun coils and flashlamps would be unused.
then someone added that. all these games just had the large transformer. I found that in a KI once and I pulled the extra iso and used it somewhere else. had some junk Wei-Ya monitor, I swapped the proper Polo in its place.
pinball has different power needs, they're not the same.