Child Guidance / Kiddie Land Trains

For sure I know the Yuuenchi series is separate from Plarail because they do not have the Plarail logo during that time, and the construction of the trains and layout are different. (although the Japanese version of Yuuenchi have blue tracks)

Those black tracks might (?) not be made in Japan, so I do not know if they are compatible with blue tracks. Does somebody have these black tracks? Please post here if you know that they are compatible or not. The shape of those piers look like the Plarail white piers. If somebody have them, please also tell if they hold those blue tracks well or not.