Exhaust cam seals different brands?

Replacing cam seals myself on EJ255 (2010 FXT) due to oil leaks and noticed both the exhaust cam seals are different brands. Does this mean the shop that said they replaced my cam seals a couple years ago didn’t actually do all 4? I ordered OEM and they are the same exact part for the exhaust cams (intake cam seals are different size)

It took me forever to get the last exhaust cam sprocket off so I don’t really blame them if they skipped it… but it does explain the oil leaking onto my exhaust