It looks like you have:
two at: 44" x 74"
two at: 32" x 74"
Looks like you'd be pretty close on your plan from this chart by Sleepys
- full is 54x75 and twin is 39x75. In both cases, you're going to have some extra (which is fine- order 2"-4" foam pads from The Foam Factory
and the folks sleeping on those beds will love you forever.