In my experience, overwriting a table with a different sized table resulted in a crash, but I haven’t tried in a while so it might have changed or bee fixed. I think I mostly use ftgentmp for some reason I can’t remember anymore, which might also affect things…
I have an old effect I’m reworking that alters/replaces tables dynamically as you move sliders, so it’s made easily hundreds if not thousands of table changes without me noticing a memory issue. Here’s an old version of that effect if you want to play with it: Effect: Shaped Up
The old version was written for cabbage1, I’m about to upload an updated version to that thread that’s functionally identical to the old one but will work ok in cabbage2. I also have a newer better version in the works, but it will probably wait on further development and features of c2 before it gets released.