I would call them similar, but not the same head. The Meathead is a carbon steel version of Joe Furlong's stainless Tuffhead. A true 3:1 ratio broadhead design based on the Ashby studies.
The Grizzly's were originally designed and manufactured by Harry Elburg in the 80's, I think. A bit wider and shorter than the Tuffhead. Grizzly's come in two basic profiles, one a bit longer and wider and have had some design improvements over the years.
All are great heads and very well made.
Joe donated several packs of Meatheads and Tuffheads at yesterday's UBI Banquet, but I was outbid at the last minute.