Ctek multi xs 3600 and 991 GTS

[porkgts]

I have the ctek multi card 3600 trickle charger. I used it on my old 997 gt3. I've now got a 991 GTS, does anyone know if this charger is ok to use? Forgot I had it but with the bad weather the car will be garaged for a while and thought a trickle charger would be worth using.

Don't understand the difference between latest cteks and the one I've got and don't want to use it before checking it won't damage anything!