Steve, as far as Sri Yukteswarji's descriptions go, the physical realm is a subseet of the astral realm and an imperfect, grosser reflection of it. By inference we may think that the dimensions are similar. It may not be like that, but I can recall no more detailed info on the specific issue.
Although i do not know.... it seems to me that we often 'see' the astral variant in our encounters with others and we are surprised to see the physical expression take precedent. When we recognize just what thoughts r within others we may have to 'extract' ourselves from their dimension of reality. It may even take us down a rough road of turmoil if we let them get under our skin. Astral and causal influences in the physical realm become great insights, great sounds and great creations. Anyone who has experienced them recognizes their presence is from a higher place that transcends this physical reality.