Note: There are several different scales that have been used. 01-03 being the most consistant. Then there was a larger scale in 04-05, which then, with the introduction of the Inika system, was replaced for the rest of the line with the exception of the starts, however was increadibly less consistant.
So, the Toa Mata are the same scale as all sets released up until 03, but no set released after up until the Stars, which were close, if not the same scale. However, the Stars Rahkshi was very under-sized.
Edit from the future of 2020: