I ran them both last winter. Very similar in size and structure. They would fit well together due to similar size. Both finished around 75 days, GW was a couple days longer. GWk was over 5 oz, GW was over 4 oz.
Both are what I consider middle of the road hybrids. A couple hits of either is ok for daytime smoke, double that and it’s more sedative. Sativa buzz on the front end, Indica mellow buzz on the tail end.h
The Grapey Walter seems to be a little more up, especially at the tail end of the buzz. They both have great grape flavor, but slightly different. They were grown in no till, water only homemade soil.
Hth
Cheers
Os