Firmware version number naming conventions?

Hi,

In the process of upgrading my firmware on my server, some of the firmware files on the download page have a letter "A " followed by a number appended at the end of the name after the version number -- see below. When I look at the installed firmware version numbers using iDRAC console, it is missing. I can't determine if it's the same installed version, or a new version of the firmware which I need to install.

For example, see the A05 at the end of the version number below.

On iDRAC it's listed as Dell SAS 6/iR Adapter, v.00.25.47.00.06.22.03.00
On download page it's listed as Dell SAS 6/iR Adapter, v.00.25.47.00.06.22.03.00 , A05
Are they the same version, or different a version, please can someone explain.

Thanks,

LAG