You cannot emulate it 1:1 i.e. just by mapping and copying settings, because the synth structures have a few but significant differences (e.g. the Retro has ADSR envelopes while A1 has ADR, ..)
On the other hand the (analog section of) the Retro synth is pretty basic so, once you learn the principles and to program the A1 synth chain, it is pretty easy to "emulate" the Retro sound by looking at Retro parameters and transform (not copy) them into A1 settings.
Recommendation: study the A1 from its manual first and learn it by tweaking existing patches, then you will find it will be easy to go to the next step i.e create your own patches and/or reproduce the Retro ones (initially best if finding a similar A1 patch and then adjust/modify it, rather than starting from scratch)
PS: for a general learning of subtractive synthesis, there are many tutorials on line, such as the massive one made by SoundOnSound between 1999-2004 and still available on
https://web.archive.org/web/20160403115 ... ecrets.htm (non need to read it all, just the first few articles)
