Compatible oils?

I've just recently changed the oil in my skoda fabia 1.9tdi PD engine using Motul 5w40 505.01 spec oil but have just noticed on my garage shelf I have two 1litre bottles of motul 5w40 LL-04.

Now both are Obviously motul 5w40 and both state they are ACEA C3 ( not sure what that means tbh) on the front of the bottles, but can they be mixed?? The bottles don't have a lot of detail on them about spec and I don't want to cause possible damage to my PD engine using the LL-04.

I was using a cheap triple qx brand oil but covering a quick 8k motorway miles on it i decided today to drop it out and replace it, garage seemed a nicer place to be anyway than the house being screamed down by the kids lol.

Thoughts on compatibility guys?