Yes!
For the most part 6CA7/EL34 are equivalents. They are interchangebale.
6CA7 was the US designation.
Sylvania made the only True 6CA7 and this tube was re branded by Philips and RCA here in the states. It was more of a beam power tube than a true pentode like EL34's. This let to a much tighter larger bottom and more focused tone.
Kind of a hybrid EL34/6L6/6550 tone. These tubes are almost impossible to find NOS anymore as many weren't made.
Eddie Van Halen used these tube exclusively on his Marshall's of the famous brown tone.. The brown sound you here is US 6CA7's, not EL34's.
For guitar amps I think they were some of the best tubes. Because you got the tightness of the big bottles, but the musical saturation of the EL34's.
This amp has the JJ 6CA7's in it.
https://www.youtube.com/watch?v=SYU19_Jbwdk