ok so instead of goin into such big procedures..why dont do one thing
import gifs..crop to whch ever size u want to and in layers panel make a group folder..and drag all the gif layers frm 1 to hw much it is in dat folder..and copy all the frames in the animation bar..click on thsi button
SELECT ALL>>COPY FRAMES..
do same wd anthr gif too..
open a new file(canvas)..
paste ur bth d gifs(hope u knw how to do it)
and add layer mask(can see dat in layer panel round shape icon next to fx) click on it..
a layer will get added wd 1 gif group..now try to blend ur gif the way u blend ur siggies
Hope i ws able to help u outπ