Battery upgrade

Hi there,

my company recently bought a new battery for my Inspiron 7506 2in1. The original battery was a 4 cells 53 WH, but we saw on the Dell site that my device was compatible with another model, the 4 cells 68 WH battery. Once that the battery arrived, we saw that they are phisically different in shape and I think that they are - contrary to what the site says - actually not suited for each other.

I'm correct or ther's a way to use the battery we purchased?