OK to do compression test on a cold engine?

[CuteBrute]

I need to do a compression test. I know the standard advice is to warm the engine first, but I can't because the car won't start. (Broken timing belt.) Going by what I've read, the most important thing is that the cylinders' readings match up with each other, not that they match up with the manual. If I do the test on a cold engine and all the cylinders hold fairly equal compression, how safe am I to assume there's no engine damage?

[G.A.S.]

dont roll the engine over with a broken timing belt. If there is a valve in the wrong position you risk bending a valve or pushrod. And if both valves are not closed properly on the compression stroke, you will get a false compression reading anyways.
you say broken timing belt, on what type car.
did the car run before? some engines will tumbel the valves if the belt breaks at a high rpm.
In most cases, not all, replacing the belt (properly) will bring an engine back to life.

[CuteBrute]

It's a '92 Jetta GL, 1.8 liter.

I was hoping to do the compression test before replacing the belt because the test apparently takes about five minutes, while replacing the belt will probably take all day because I'm new at this. But going by what you've said, I've no choice but to do the belt first. Someone earlier mentioned testing for engine interference by turning the crankshaft by hand, but even if there's no interference, I still won't be able to trust the compression readings if the timing is off. So, looks like I'll be replacing the belt first.

Thanks, and any further advice is welcome.

Edited to say: the car did run before the belt slipped. Also, I've gotten contradicting information as far as whether the engine is interference or non-, but I think it's probably okay because I didn't hear any kind of nasty sounds under the hood when the belt slipped. The engine just quietly died.