The answer is almost certainly ‘no’.
Dialysis depends on a great many thins but important here are the blood flow rate, the dialysate flow rate, the dialyser membrane used (its surface area + its construction), the dialysate composition … so many variables and more.
If the dialysis SYSTEM (the machine) and SETTINGS (the patient variables) are the same, then … yes.
But most centres use single pass systems - commonly but not restricted to the various Fresenius and Baxter/Gambro models. The NxStage is a low flow (and the ONLY low flow) system, and low flow vs single pass systems are worlds apart in what they do. Low flow systems employ very different flow rate ratios for blood flow and dialysis fluid. As a result, the delivered dialysis efficiency will be very different.
Thus my answer is almost certainly no.