My guess is they are the same,..otherwise I'm sure it would be denoted as an "Upgraded" pump on the Pressure Tek site. I remember guys saying that PWMall had the best prices,..but that was few years ago. It's hard to beat Pressure Teks shipping. At least for me here in Pa. If I'd order now,.it would be here tomorrow morning. Other than that though,.take your pick and use price as your guideline.
*Just a personal note: I prefer to give the my money to others in that in the industry and communicate with us here on the boards,.such as Pressure Tek or The Power Wash Store. But it's like I tell my local guy,.whom I'd rather give all my business to. I tell him he has to at least be in the ball park on pricing,..I mean I'll spend a little more to these guys,.but these business's also have to at least be competitive in pricing. Also,..I don't ask my local guy or anyone else for rigging or servicing,..I'm capable of doing that all my self,..which many of us are.
Jeff