Yes. You can change the currency of the records in Zoho CRM. But this is subject to certain conditions.

If you have NOT enabled Multi-currency:

You can change the default currency by changing the Locale Information under Setup > Company Details > Locale Information. The currency you set would be applied for records across the CRM.

If you have enabled Multi-currency:

You can change the currency for an individual record by editing it.

1. Go to a module and select a record.
2. In the Records Details page, click Edit. 
3. Select the desired currency from the Currency picklist field.
4. Click Save.
   The currency is now changed only for this record.