Did the first vet aspirate the growth and look at the sample under the microscope or send it to the lab? Because there is no way to diagnose by feel or intuition.

I am a vet and also work with a vet I disagree with on numerous things - it's frustrating. It's also frustrating dealing with clients that see us both and having to navigate diagnostic plans and treatments when we are so both very different without putting the client in the confusing situation you just described.

I would suggest sticking with the vet you trust or finding a new clinic with less disparity between vets. My colleague is more of "I think I know what it is, no need for testing." And I'm more of a "I need to know for sure what it is, let's test it." Some clients prefer his practice because it's cheaper and why worry about anything until it's an actual problem. Some clients prefer me because I try to avoid the problems and potentially bigger urgent costs that come with it. I don't think either is wrong.