Possibly, but probably not enough to justify keeping it unless you can do camera repair yourself.

The T6s/760D and 80D may share some basic parts, such as the 24.2 MP sensor, the lens mount ring, screws, and possibly the LCD since the screen specifications are similar. However, key assemblies like the mirror box and shutter are likely different because the cameras have different performance specs.

The bigger issue is usability: even if a part physically fits, many internal camera parts require precise alignment and calibration. For example, replacing a sensor is not just a simple swap if you want autofocus and focus plane accuracy to remain correct.

So unless you have the skills and tools to diagnose, transplant, and align parts yourself, a damaged T6s is unlikely to be a practical backup-parts source for an 80D. In most cases, it makes more sense to sell it as-is to a technician or parts buyer.