Is directi domain reseller account and resellerclub account one and the same thing ?

Yes Resellerclub is Directi's reseller "division"

Resellerclub is a member of Directi Group. Directi has a few web sites that provide different services. If you want to open a domain reseller account at Directi when you must go to www.resellerclub.com

Is directi domain reseller account and resellerclub account one and the same thing ?
Essentially yes; as FHH - Tim and dhcart have said they are provided by the same company.

DirectI created ResellerClub, the white label reselling arm of the company, after starting to resell domain names and similar products.

The "DirectI domain reseller account" implies that it would just resell domain names, however the ResellerClub account actually enables you to resell more than domains; ranging from SSL certificates to web hosting and DNS services. Basically, ResellerClub incorporates reselling domain names, as well as other additional services that the phrase "domain reseller account" does not imply.

Hope that helps,

In three letters "yes"