Shimano BR-R317 pad compatibility

[Zippy7]

I have Shimano BR-R317 disc brakes, and they came with G01S pads.
I have a couple of spare B01S pads, so I tried a pair in the brakes as they are very similar in size.

They fit, it seems to brake okay, but there is a slight rattle sometimes (presume there is a slight difference in the width)

Can anyone tell me if this would be a serious safety issue, or if its just a noise problem.
Don't want to have a big accident for the sake of a few dollars, but if its just putting up with some noise, then I will prefer to use the pads instead of losing the value.

Cheers.

[10speedsemiracer]

There is apparently a minor difference in size, the B01S is not as wide and not as tall. Over a prolonged period of time the fore/aft movement (that's what you're hearing) especially under braking could damage or prematurely wear your caliper. The B01S will go into a caliper designed for a G01S but not the other way around, apparently.

[Zippy7]

Well, it doesn't rattle under braking, but was wondering if it was going to be a serious issue.
I think I'll swap the B01S to the back and keep the G01S in the front and just go harder at the back to wear them out (unless I find a pair of cheap Spyres or HRDs to swap out the 317's)

[10speedsemiracer]

Pad will move back to front inside the caliper under braking, may hear a single clunk while it does this, and has the potential to damage the inside of the caliper.

[Duck!]

As 10speed says, it's not worth the risk of potential damage to the caliper for the sake of a few dollars. Just use the right pads.