The 4313B model used the Le111H woofer .
IMHO, Buy those local Le111Hs ( after an inspection deems them worthy ) .
The SFG magnet "H"s are arguably a better all round woofer ( though FWIW, I can also like the le111a for its coil&cone / too bad about it having an alnico magnet
) .
You ought to notice a little extra bass output with the "H" ( when "A/Bed" against the original le111a ) .
Do a site search ( for "3113B" ) and then read up on the ( very ) slight revisions made to the N3113 network .
Read
this thread specifically !
>< cheers