Laurence Meredith, in his book "Original Mercedes SL, The Restorer's Guide to 300 SL, 190 SL, and 230 / 250/280 SL models to 1971," lists 110 "production changes" for the 230 SL from Chassis number 3 to 19832. While I do not challenge the above assertion that "from 10 paces, very little changed", nor do I infer that Meredith's book is 100% accurate, I encourage you to purchase a copy of Meredith's book to answer your question. It is one of many books available on the subject and will provide a wealth of additional information for you in the future.
If someone wants to challenge me on the number of changes listed in the book, let me state clearly that I counted quickly and without my glasses on!
P.S., I did not see any changes in the windscreen wipers.
And let me add my welcome as well!!
Norm