Text comparison - closest match

I have data in 2 worksheets, say WS1, WS2

WS1 contains following plus other data (here i used : to separate cells)
--------------------------------------
FirstName : LastName : UserID
--------------------------------------
Serine S H : Koay : WKOAS
Roger : Groebi : WGROR
Jill : Neubronner : WNEUJ
Su Ann : Low : WLOWV
--------------------------------------

WS2 contains following plus other data (here i used : to separate cells)
--------------------------------------
FirstName : LastName : UserID
--------------------------------------
Serine : Koay :
Roger A : Groebi :
Neubronner : Jill :
Su : Ann Low :
--------------------------------------

I need to find userID in WS2 for corresponding names from WS1. I joined First and Lastnames in both the worksheets, used

VLOOKUP and got the userid in WS2, if the names matches exactly (not shown here). But if the names doesn't match exactly, as

above, VLOOKUP doesn't work. Eventhough we can see the names are there, but either contain additional/less initials,

reversed first and last name etc.

Is there any other way I can get the result?