Very decent 13.2 t, F/A-18E/F ~ 12 t, KA-6D 11.7 t, KA-3 13 t.
Ofc max not transferable, about 50 % depends range for the tanker ?
Remains to know how many time this S-3 can serve the first put in service in 1974...
Reitred in 2009 the more old have 35 years, less stressed as a Fighter but no completely redone as a A-10C with new wings etc...
If this eventual Tanker UAV have size of X-47B with a Max weight of 20 t, S-3 do 24 t can carry 10/11 t enough but how many in a CAW for to be efficient and reful a Sqn.
Thinking normaly planned 4 minimum by CAW same number as KA-6D, fighters needs : F/A-18E/F carry 6.3/6.8 t, F/A-18A/C 4,9 t then on average 5.5 t in this case a Tanker can refuel ~ 2 fighters x 4 : 8 fighters then idealy 5 Tanker for 10 fighters.
But it is not all F-35C have less need get an enough more big range CR 1100 km as F/A-18E/F 900, F/A-18A/C 700 but remains very interesting coz despite this it is not a very long range, as KA-6 had 1400 km ! F-14 1200 km, F-35C carry much 8.9 t more as a F-22 ! for him more Tanker required.
But logicaly in an airstrike no mixed stealth and no stealth the second highlight the first... or a refueling enough far of targets more easy to say...depends loadout mainly.
Don' t forget refueling capacity in a CAW it is " only a help" for fighters nothing to do with USAF which with her 450 big tankers can refuel easy several Sqns in a big airstrike.
And armed UCLASS planned had to be very interesting for her range CR ~ 1500 km ! with a decent payload 2 t.