The similar exit option is available for the 767-300. Check out the difference between, say a BA example and one from the AA fleet.
The following are the different verions of the 757-200
1. 757-200 - Standard passenger version with choice of RR and P&W powerplants ranging up to 43,000lbs.
2. 757-200PF - Package freighter, originally ordered by UPS, but several other carriers now use them, though in smaller numbers.
3. 757-200 Combi - Forward cargo door incorported forward of the wing. Royal Nepal appear to be the only operator of the type.
3. 757-200SF - Special freighter. Ex British Airways passenger machines converted by Boeing to freighters on behalf of DHL. Powered by RR RB211-535C engines. Old timers, some nearly twenty years old.
Hope this helps.