As you can see, the brackets are different. It's obvious.

The mounts, on the other hand, are interchangeable. In fact, I would use the civic mount insted of the GSR mount because there is a plate on the frame that the civic mount straddles. You would have to cut this off in order to use the GSR mount.

How 'bout that.

This is wrong

The kid is not swaping a gsr motor he is swapping a LS motor and you would want to use LS mounts because the civic mounts are not going to be able to hold the weight of motor as well as the LS mounts and you don't have to modify the mounts at all. I have done these swaps before and always used the LS mounts. The only time you would want to use the civic mounts is when you never got the LS mounts. This would allow you to get the swap done but after some time the civic mounts are going to wear faster and will need to be replaced long before the LS mounts will.