Well, that's a little mixed in question and answer.

When you say CFL Watts, are you referring to the actual wattage of the CFLs or the incandescent equivalent?
We'll go with the actual CFL wattage.
Will 250 CFL watts be like 250 HPS watts? No. I'd say the 1st 2 feet from the bulbs would be kinda close, but farther away you lose Lumens from the CFLs, it might still be bright, but no where near the intensity of an HPS.
You can move the CLFs alot closer to the plants then you could with the HPS, so you can start to make up for the difference, but they would still fall a little short. Now if you put a cool tube on that HPS then you can get right up and cozy with the plants as well and blow the CFLs out of the water again.

Heat.
CFLs do run a LOT cooler than an HPS, but you put 250 watts of CFLs in there and it ain't all that cool anymore.
Cool tube on an HPS and vented outside will be less heat.

Not sure if I helped or compounded your questions.