does my Bengal need a different diet than my tabby?

Yes and no. Bengal tend to need a higher protein diet and cannot be on an all dry food diet - they should have some dry and canned each day and raw at least 3 times a week. Your domestic tabby would benefit from the same diet.

Try Wellness, Blue Buffalo, Natural Balance, Merrick, or BG (before grain) in canned and pick one of them for your dry. Raw should be beef or chicken

i heard bengals need more canned food than dry because their stomachs are sensitive and maybe some raw cat food that contains rabbit. and it takes a very long time to change their diet, just a bit at a time, maybe a month or two, i'm not sure, again, because of their sensitive stomachs.