The stuff with the 11 * 54 * headstamp looks like 1950s Yugo surplus to me. I've personally had 1/2 dozen case ruptures with that stuff, thankfully in stout Mauser actions so none the worse for wear. I personally would be reluctant to shoot it out of an FN-49. Plus it is known to be corrosive, and cleaning after corrosive ammo is a little more work with a semi-auto than a bolt action. You have to make sure the entire gas action gets properly cleaned not just the bore, bolt, etc.
The other stuff with FN 69 I believe is Fabrique National (Belgium). So it should be safe to shoot out of your FN-49... but I can't tell you if it is corrosive or not. US made ammo from the 1960s usually is non-corrosive... combloc ammo of that era usually is corrosive... but I don't know for western Europe... Unless you can find out otherwise I would assume it is corrosive and clean like it is.