easy way to figure it out is take the compresser cover off both turbos, put the hx55 cover on the hx35 frame and if it isnt going to work youll know pretty fast.
my pro52 is wayy different from my hx35, i cant say iv seen a hx55.. the hx35 uses a snap ring to hold on the compressor cover, and the 55 will most likely have a v-band clamp. i rely dont thinks it is possible.
especialy if you like things that are easy or cheep lol, the 5' exhaust will be much easyer
you would have to remove the hx35 wheel, get the frame machined for the 55 wheel to sit in there then have the hx35 cover machined to match the 55 wheel.... fancy work and you should have it balanced and guys will tell you youll blow it up etc....
hx40s are what you want if you wana swap bigger parts onto a hx35 or to take ur 35 exaust housing and put it on the 40 for quicker spool and if you do that youll need the hx40 down pipe...
hope that helps a bit, good luck!