You need to check your mount's configuration. Some TV mounts have adjustable supports (for square or rectangular screw-hole patterns at a limited distance range), some have fixed (specific type of screw holes), some have X-type brackets (with several screw holes but only for a square screw-hole pattern).
This can fit square or rectangular screw-hole patterns:
This can only fit a specific screw-hole pattern:
This can only fit square screw-hole patterns of 2 different sizes: