I do it all the time.
As the pipe heats up it will expand like a can of worms, can be a esthetic issue, also makes noise if rubbing house framing.
Look at your specs, pressure rating goes down as temp goes up!
Most radiant pex heat systems run 140F or less, baseboard will run up to 180-190F.
And don't forget to use oxy barrier pex or you have to keep everything in the system non-ferrous.
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