Vishnu sahasranamam, sloka3

Sloka3:     Yogo YogaviDaam Nethaa Pradhaana Purusheswaraha
                Naarasimha vapuhu Sreemaan Kesavaha Purushotthamaha

The One, who is connected with everything,  every wheŕe, ; the Precider of Unity, the Ruler of Universe,  the Supreme being,  the Supreme Lord of Gods, the Lord Naarasimha, and  the Ancient Eternal, the Gracious ( husband of sri Lakshmi devi ),,  the Sri Krishna,  the best of all purushas.( Devathas )is Vishnu.

Lord Narasimha and Lord Sree Krishna are two different incarnations of Vishnu, in two different Yugas. Vishnu manifested as Narasimha  killed the rakshas HiraNakasyap and also manifested as Sree Krishna to kill many raakshasas like Kansa, Naraka, Sakataasur, Poothana, Vrishabhasura and etc. Vishnu, the all existing  Supreme power, the Lord of lords, connected with everything everywhere in the universe. Lord the best, coordinates all existings and organises the proceedings of this Celestial Universal play. That's why, Vishnu is called  "Yogeswara".

"Yoga" means Connecting the mlnd. ConnectingTo what?  Connecting to That " Universal Consciousness ". Vishnu is that Universal Consciousness.

Purusheswaraha= Lord of lords
Purushottamaha =  the Best of all gods
Though both the words appear the same , they differ in the sence.
The first one speaks the Power, and  the second speaks the Grace.

            
                   Om Vishnave  namaha