The main difference between the HP Smart Tank 7605 and the HP Smart Tank 7305 lies in the following points:

- Fax function: the HP Smart Tank 7605 is equipped with a fax function, while the 7305 model does not have this function.
- Automatic Document Feeder (ADF): Both models have an ADF, but the presence of the fax function in the 7605 is the significant difference.

In other aspects, such as print resolution, duplex printing, and connectivity options (USB, Ethernet, WLAN), the two models are largely identical.