You don't want to do this.
AEM 6.0 and AEM 6.4 are more dissimilar than they are the same.
- repository structure is different (see AEM 6.4 restructuring documentation)
- different underlying repository (crx2 vs oak-segment-tar)
- AEM 6.0 is also end-of-life and Adobe will not support you for this product version so you'll be on your own. (see Adobe EOL Matrix)