Not the op, but syntactly they are ver similar. And so for minor things like looping over a matrix or making a plot or some calculations, It’ll be the same. Your intro numerical course will not really know the difference. It’s when you get to the packages that there’s massive divergence. Matlab really sells packages that have all sorts of libraries and gui things built in to do some advanced calculations or pre-Canned tool. They also change the package syntax from time to time. For things like signal processing or filter design, the tools reign and most scripts depend on them. Octave has a totally difference package ecosystem and syntax for loading packages.
So for basic things, you can go between the two fairly easily. For anything advanced or for 90% of scripts you download from papers, octave will not work.