No, it's IDENTICAL principle of colour to colour on an an LCD panel. No-one quotes tne mono resolution of the actual LCD, just the colour resolution, because quoting the underlying mono resolution would be misleading. LCDs also can be stripe like Triton, or a 2 x 2 pattern like Kaleido (but with more staurated colours), or other more complicated schemes with R, G, B, yellow and white.
Once you add a colour filter to a mono panel, the real mono resolution is lost. Certainly for LCD and eink, if the text is black and the background is white there can be an apparent slightly better quality than the 150 dpi.
This image from E Ink Corp, is exactly what I wrote. There is a standard 300 dpi mono eink panel and there is a 2 x 2 layout of translucent coloured dots printed on if, giving a colour resolution of 150 dpi. The pixels are no longer black, white and 14 greys, but tinted, so true 300 dpi is gone.
Attachment 207737
The 2 x 2 coloured dots is the printed layer between the mono ink and the liight pipe for the front light. Each coloured dot has to exactly cover one mono pixel
A hypothetical 2000 x 1200 LCD, or eink, colour panel that using stripes (like Triton or TVs use) is 6000 x 1200, or 2000 x 3600.
If it's using a 2 x 2 pattern so that with squarish pixels both on the actual panel and the coloured pixels (which use 4 mono pixels under the filter), then the actual underlying mono panel is 4000 x 2400 pixels.
It's true that because of the subpixels the mono dpi isn't as bad as 150dpi (equally true for LCD and even OLED), but you do not ever have the same quality as as a mono panel of 300 dpi.
Some sellers and people describing color eink based of kaleido or triton are either mistaken or being misleading. No-one sells colour LCD or OLED that way and given 200 to 1000 levels per sub pixel, vs 16 for eink, the sharpeness of the same colour dpi panel in LCD/OLED is much better than eink.
The colour is simply passive translucent dots on a mono panel in the case of eink.