Hi Mike - take heart - just keep your ear to the rail.
It took me a few years to find an authentic 35Rem Marauder that was for sale but I did finally. I bought it recently from the original owner. He bought it new in 64. I won't receive it for a while as it's in the export/import pipeline.
"Aside from the safety, is there a difference between the Marauder and the 16" LTS?"
No I don't think so - except that the Marauder came in 30-30 AND 35Rem and was made in 63 and 64. The 336LTS was only issued in 30-30 I believe for two years in the late eighties. I have one and use it when handy carry is paramount.