I have some cuts of beef intended to be used for beef jerky. I have not yet dried them -- the meat is still fresh. I don't know what cut of meat was used. Can I use it for stir fry?
Just my own opinion but I think if the cuts are made across the grain rather than with the grain it should be fine. With the grain might be tough to chew. There are 2 camps on cutting jerky meats so it really depends on how it was cut.
If it's cut thin enough, and if a visual inspection shows little in the way of sinew and connective tissue, I'd say you should be fine.
Interestingly, I have been doing the opposite recently. I have a lot of beef cut for stir fry / schnitzel, etc... that I've instead used for Beef Jerky. It's been working well.
Look for authentic recipes for machaca con huevos, Chihuahua-style. Not quite stir fry, pounded or shredded jerky cooked in a skillet with eggs and tomatoes, but it's getting there. It is common at Mexican restaurants on the US West Coast but usually made with fresh roasted or braised brisket, although I occasionally see the jerky version and a few other jerky dishes on menus. I also see the jerky in Mexican markets but I can't remember what they call it or any of the other dishes except machaca.