No. This is the most frequent cause of errors. The two versions store data in completely different formats, and they are not interchangeable. A save made for the Steam version will not work on the MS Store version, and vice versa.
For the , the correct path is typically: C:\Program Files (x86)\Steam\userdata\[Your Account ID]\1293830\remote forza horizon 4 100 save game steam link
Here are answers to some common questions about using 100% saves. and vice versa. For the