Kilometers to Miles

i recently came across a 98 Camry with an instrument panel that was for Canada so it is set in Kilometers and i was wondering if it would be difficult or there would be a problem with replacing the cluster with one from say a junk yard or a parts store that uses miles.

Unlikely that would work.
Best idea is to learn a few target numbers and just re acclimate your thinking.
65 miles is 105 KM
45 miles is 72 KM
80 miles is 130 km
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120 km is 75 mi.
80 km is 50 mi.
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1 mile is 1.61 km
1 km is .62 mi.
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I still drive a 1977 Toyota pick up truck occasionally.
The speedometer has never worked properly long as I've owned it. On rare mornings when cold, it works, but usually it is way, way off -- like driving 5 mph it registers 80 mph, or at 25 mph, is goes all the way around to the bottom next to zero.
Has never been a problem in actual driving conditions. It's a five speed manual transmission, so I have some indication by which gear I'm in, but generally, if you're passing everyone you're going too fast, if everyone is passing you, you're going too slow, if about as many are passing as not, you're going at the right speed. For cruising the open road, you can get a secondary indication from the tach, if you have one. Point is, strange as it may sound, not having a speedometer is not really a problem, though when I have a passenger, and we're driving slowly I point at the speedometer and say "look we're doing 80" they do look scared, but is really not a problem.