Both of these pages appear to be more for the teacher than the reader.
You are right that there currently are not guidelines for Early Learning (though BANA is working on some!) so all I can give you is opinions.
Generally, materials for early learning are double spaced, but the double spacing does not apply to tables (which I believe both of these are). The stairstep method would work well for both of these print pages. Stairstep requires a transcriber’s note (see Section 11.18 of Braille Formats 2016).