I did spend quite a bit of time previously to posting and found info stating that they are the same, but there were some inconsistencies.
Since posting I researched for around an hr, and I don't know how many posts and came to the conclusion that they are the same.
I just ordered the FMS-M-6051_A427 a few minutes ago.
I just hope it does not leave a ring on my Edelbrock head where the fire ring is.
I also hope they seal the water passages well.
Thanks for the help.