A314 1.23A and A314 1.23B is both based on the oil version, A314. The differences between A and B however is A is a little stronger than regular while version B is the same as the oil version.
The only thing I can tell if you apply it to different spots is what kind of an effective is more noticeable. Like if he talks a lot with his hands and if you want other people to have a lot of conversations then a hand application along with A314 near the neck for self effects. For me personally, I like to throw everything on one spot since it’s cold outside. Covering with perfume is optional. Products don’t come with instructions.
I took the spray option first, although it was the now discontinued MX347 trial version.
It was the effects from that which convinced me to go for the oil based version & overall it was very worthwile.
I still carry a togo of spray with me though, for times when a quick topup is needed, although I don’t need it often since I learned that a little moisturiser on my application points prolongs A314’s working life considerably.
For instructions and advice - there is loads of info here and in the A314 users forum. Get searching.