I don't know how it worked in Brawl, but there's definitely no formula like "add 20% endlag for throwing Bowser, 20% endlag for Jigglypuff". It's a variance unique to the throw. I understand Mario's Bthrow in Brawl was very dynamic. Well in Smash 4, the startup for throwing Jigglypuff is 39 frames, 44 for WFT, and 49 for Bowser pre patch 1.15. Sounds consistent, but its endlag is not. 14 for jigglypuff, 17 for WFT, and 18 for Bowser.
The only way to know is to frame count it yourself. But these charts are a bit out of date after Bowser's weight increased. No doubt some startup or endag values are now one frame more for him. I'm also concerned that my partner and I were not on the same page with counting when endlag began on some charts. I counted startup as first frame to the frame where the victim is released and dealt damage. But throws don't have hitlag, so I'd count endlag starting on the frame after that so there's no overlap. But with normal moves, the frame that damage is dealt is separate from the frame where the victim is released, because there's hitlag between them. Choosing what frame is the first frame of throw endlag is not something I've ever heard somebody's opinion on. But no doubt there will be some difficulty in getting people on the same page.
And just thinking about reinterpreting it further into FAF is going to make me go crosseyed.
Edit: Forgot to link what I was talking about.
