Yep, same knife, same Chinese factory...they just slap on a different logo and triple the price.
They certainly are nearly the same but I don't know whether they are completely identical.
I bought the CRKT Drifters and checked out the 707 at the time I was looking at Sanrenmu knives.
Here is what I found:
Sanrenmu lists its 707 model as having a blade made from 8Cr13MOV steel with a HRC of 57 or 58 (differs depending upon the source.)
CRKT lists its Drifters as having a blade made from 8Cr14MOV steel with an HRC of 58-59.
I have no idea if this represents any meaningful difference -- these are both Chinese steels. But it does suggest that they might not be identical clones, FWIW.
BTW: I have seen the 707s advertised on fleabay for $9 ($4 plus $5 shipping.)
As to the CRKT models, I prefer the aesthetics of the SS frame-lock version but when it comes to pocket EDCing, I slightly prefer carrying the lighter-weight G10 liner-lock Drifter.
As to the clips, they may not be the best-looking but I like them because they are tight enough that they don't slip off the thin pockets of my running shorts.
I have several each of the liner-lock and frame-lock Drifters and they are all well-made and have been trouble-free. It is good to know that CRKT is there if the consumer needs service.