Dual 12 inch subs compared to dual 10 inch subs?

I recently put dual 512 MTX 12 inch subs in my Tahoe and connected them to a 600W dual channel amp they blew today and I went back to the retailer and they found they didn't have anymore in stock so they said they would give me Dual 10 inch MTX Sledge Hammers that are $200 more expensive and they said they are smaller but have more power and a different style box. I am connecting them to the same amp, will they still have as loud of a sound?