There is no legal distinction between a "conversion" Roth IRA and a "regular" Roth IRA, both are simply Roth IRAs.

A conversion Roth IRA refers to a Roth IRA that receives money from Traditional IRAs through a conversion, rollover or direct transfer.

If an account is designated as a conversion Roth IRA, then that account can only accept IRA conversion contributions made in a single year. A separate conversion Roth IRA must be established each year in which an individual desires to convert assets into a Roth IRA.
Contributions are permitted until April 15th for the prior tax year.