Difference between 110994 & 110995?

Each bank gets one inboard flange and one outboard flange (with the inboard flange being on the cam not near the Tensioner) -- like this:

https://www.ferrariparts.co.uk/diagram/ferrari/308-gtb-gts-carburetor/008-timing-system-controls

You got the wrong parts.

 

I just went through the same question earlier this year. The flanges are supposed to act much the same as guardrails on a bridge, keeping the belt from wondering too far in either direction. My car had one of each kind on one bank, two of the same on the other bank, a miss match that happened sometime in my car's past. Looking at photos of 308 timing belt configurations I found that most cars have one of each on each bank usually in a configuration of the flange on the outside on the first sprocket after the drive sprocket near the crankshaft and on the inside on the sprocket just before the tensioner. That being said I found photos with every configuration possible. Steve's reference is a good policy. In reality the belt should never ride against the flange, it's just a safeguard. I've worked on many cars of different manufactures with cam belts that have no flanges on the sprockets.

 

The flanges are on opposite sides to keep the belts centred and prevent the risk of them sliding off.

You will have ordered 30815110 from Superformance (https://www.superformance.co.uk/308/ech.html ), which should have include 2 x 108033 pulleys, and 2 x 108034.

Interestingly, Superformance say: 108033 (Supersedes: 102586, 110994, 113097), and 108034 (Supersedes: 102587, 110995, 113098)

Ferrariparts.co.uk though, state 113097 and 113098 are the suppression parts:

https://www.ferrariparts.co.uk/part/ferrari/113097?id=61016
https://www.ferrariparts.co.uk/part/ferrari/113098?id=57749

Whichever you order, they should definitely not be four identical pulleys!

It sounds as though someone at Superformance have made an error whilst filling your order, and have put four of them same pulleys in the box! (which would be worrying to me that someone was not paying attention at Superformance - Not good!)

You need to arrange to have two of the pulleys replaced with the correct pulleys - Do not use the four that have been sent!

 

Thanks for the update (and being honest enough to admit you made an error - Many wouldn't ) - I'd put it down to the excitement of receiving the pulleys