Off! Insect repellent version differences?

I was at the store today looking at bug spray and they were all Off! brand and all had 30% deet as the active ingredient. But there were different versions between them. I saw one that was Insect Repellent 2, Insect Repellent 3, and Insect Repellent 5. Does anyone know what the difference between these can be? I have tried to look it up and cannot find anything about it what the differences are and it’s driving me crazy!