West Marine JL Mixup?

[Monterro]

I just picked up 3 sets of JL MX650 from West Marine. I noticed that one of the boxes were a different color but didn't thnk too much about them. They all rang up for $199 plus tax. Installing them I noticed one pair is different from the other. It looks like I may have received the M650 for the price of the MX650. Let me know if I am correct. Also if so where should I place it. I am running 4 of them inside the boat with the other 2 behind the swim platform cushions. Should I put the M650s behind the cushions? I am running them off 2 Clarion XC1410.

 

[Speedling]

Whats the difference between the two?
Yeah, put the two odd ones in the back swim deck if it's all about looks.
If the two odd ones are a better speaker put them in the cabin rear as that's where most passengers will be.

 

[Monterro]

They look exactly alike except the backs of them. Not sure of the difference between the two. It's a substantial difference since the M650s are $200 more. Good point on location.