scarpa instinct sizing

noob to the forum looking for advice.
ive been out for a couple years after getting my my fingers wrapped up in a mill.
my favorite shoes were venoms. i geuss they arent so easy to find now.
i think i wore out a bunch of pairs of them in 39.5
my current shoes are vipers in 40.5
ive got a pair of solutions in 40 that take a couple helpers to get into, hehe.
i wear a 9.5 vans street shoe.
what i'm getting at is what would this convert to in a scarpa instinct s.
or what other current slippers are comparable to the venom.
thanks for the help. if i find the right shoe im stockpiling this time ;)
edit: ive spent a good bit of time googling for this info.
im in north central pa and cant try them on anywhere close..

i wear a 40 in the Muira lace-up and a 41 in the Instinct lace-up.

thanks fellas i appreciate it.

Beware the difference between the slippers and laces!

I wear a 11 street shoe (44.5), a 43.5 in instinct slippers, but I could not get my foot into 43.5 instinct laces. I never did try to size them correctly, I just sent them back. I probably would have needed to go a full size up, so a 44.5, or my street size.

Same as most folks have been saying: I wear a 41 Sportiva Miura VS and a 41.5 Instinct Lace. Size is pretty similar between these 2. My 41.5 Instincts start tighter but they stretch into perfection!