[Boatanchors] 6146 question

[corner five]

hi group.
I am the new owner of a viking ranger 1, ver2. fully restored, and soon 
to be on the air.  I'm new to the world of tube rigs and wish to learn 
as well as do right by my new treasure, so looking for your thoughts 
related to the single 6146 final.
.
I have read that there are four variants of the 6146.
=> 6146, 6146A, 6146B, 6146W.
My ranger currently has the 6146A installed.  Somewhere down the line I 
may need to replace this tube.  From what I read the 6146 and 6146A are 
essentially identical and both will work fine in this transmitter.
.
Question: Can I safely use the 6146B?  If so, will I need to change 
anything from the current (6146A) setup to accommodate this different 
final?  I ask because the "ok" use of the 6146B seems to be yes or no 
depending upon what transmitter you are using.
.
Same question for the 6146W.
.
.thanks.