Fuse board

Hello everyone, if I could

welcome myself, my name is Patrick & I am new to the forums, but have owned my 1989 B3 model 2.2 E (2226 cc) coupe for around 4 years now, which I love I am needing now to do some work on the car & was hoping to pick your brains & use your knowledge & experience along the way as I restore my car, according to my owners book it says it is a

8B3 014 100kw engine no beginning with the letters KV, can anyone tell

me what would be the injection system used on this car I.e. Jetronic, KE ketronic etc. 

My first drama is I may have to replace the fuse board as it’s looking like there is corrosion inside between the fuel pump relay & fuse as a result of water in the fuse box due to a faulty screen rubber, the car starts then dies, then doesn’t start for a while then starts, fuel pump is new & I was told it’s possibly the relay, I am currently trying to source a new relay, but the part I’m told I need is 443907385F which seems to be hard to find, but failing that I have a spare fuse board, which has a relay no 208 & I am led to believe that is the relay for the fuel pump on this board, but the boards have very different serial numbers underneath, am I correct in thinking the sore board is from a B4 coupe where as mine is a B3 coupe.

The numbers on the board in the car which is a B3 model are as follows 

896113 SHO 443941822A

the replacement board I believe is from a 2.3E & possibly a B4 model & the numbers are as follows 

996051 SHO 443941822B

would this be a straight swap or are they very different, apologies for my ignorance & thank you in advance

patrick