18/20, they're fairly easy to tell apart, except for MATTEL and TOYOTA which are quite subtle (and I got wrong precisely because I couldn't remember which is which). Both the capital and lowercase R are a dead giveaway.
MATTEL and TOYOTA are the most difficult ones IMO. I got Toyota right because the non-circular O's in the Arial variant just look wrong to me.
The Y is also slightly different too.
TOYOTA was completely impossible to me. I had AGFA wrong because I'd forgotten which had which G. I got lucky on MATTEL. The others are easy once you know that Helvetica loves its horizontal lines.
Those are the two I got wrong as well. I had problems with capital R myself though.
Same. I wasn't sure what to look for with those particular capital letters.