Hi Paul,
both shocks were used on the RGS 1000 SFC. The golden Marzocchi shocks were used on the early modells. Due to them leaking rapidly and as they were a bit on the soft side (and potentially due to Uwe Witt's recommendation?!?), the factory later changed to Konis. Konis were THE aftermarket-Shocks at that time with an unbeatable price-point and a life-time warranty (399,-DM/roughly 150€ at that time enduser price).
As far as I am aware, there are no repair kits for the golden Marzocchis available, as the top "nut" has the oil-seal build in and you would need to replace the whole top nut, which is not available. Or machine one with a seat for a new seal, which is a lot of work and not really worth it.
The Konis are a bit shorter (362mm compared to 375mm on the Marzocchis) but as they are noticeably less soft, the riding hights is mostly the same as with the Marzocchis. From 20 years old memory, the Marzocchis though were more responsive and foregiving than the Konis.
That all said, the question is if you want a period riding experiance (and/or look) or a better/improved riding experiance...
If the later, go for YSS or Wilbers, Öhlins, Maxtons or what ever modern shocks you like and can afford. The difference is significant and if it is like with me, you start thinking about improving your fork pretty soon...
