Muscle Confusion™ FTW!
Exercise has nothing to do with fat loss except that it burns calories and not that many.
Our bodies do not get confused by new exercises nor do we need to keep our bodies guessing to keep losing fat.
If you want variation - awesome. If you like what you're doing there is no need to switch it. Yes your body adapts to movements but the number of calories you burn doesn't change much as a result.
I am only talking about the context of fat loss.
To increase your strength or endurance over time things are different.