I’m sure there would be a difference....... how much? Only way to know is do the test.

When the TF 240’s came out, on their 600hp test mule I thought they said their heads were better than the RPM’s by 30hp.
That was ootb heads, on a motor that made 85hp more than the one we just ran.
This one had very mildly reworked heads, and less hp/ci....... so I’d expect the gap to be lower than 30hp....... but that’s pure speculation.

It wouldn’t surprise me if you did the test on a bigger cube motor with a bigger more aggressive cam that you could get the difference between ootb RPM’s and ootb TF240’s to be over 50hp.
Then, on an 8.5:1 383 with a stock replacement magnum cam and an old dp4b with a 600vs carb, there might not be any difference.

The motor that was on the dyno yesterday was something I originally built in 2004, that had a problem with one lifter bore.
The lifter bore was repaired, the heads freshened up, solid cam out, hyd roller in.

The heads on it flow 290/217@.600.

Had it been built from scratch today, it might have gotten different heads.