Likely not I suppose, I think the difference is in QC. Inspection and rejection of the inevitable bad parts when buying from China. I would think/hope Edelbrock does a better job than SM.
I've been looking at the trickflows, and $2400 loaded and ready to go is a good deal vs the normal price of $1800 for the loaded SM heads.
Then use the often given 10% off deals Summit offers to save 200.00 and buy the stud or head bolt kit needed for the TrickFlow heads. I love their products and continue to cross my fingers they come out with a better flowing race type head. Then I’ll buy a set.