I Have two Christmas cactus' that bloom throughtot the winter and I love seeing the bright blooms. Yours is lovely with the two plants together and different colors of blooms.
This is what I have found works with my plants. In the summer I take them outside and they are in a slightly shaded area, they need light during the summer but not direct sunlight, that will burn the leaves (mine are on the east side of the house).
The plants need to be grow to the pot-not sure how to word that, not root bound but not too much extra room either for the roots.
I only fertilizer during the growing season and that is a bit haphard.
When the days start getting less daylight in the fall, bring the plant indoors and keep it as dark as possible, some people put a paper bag over the plant or put it in a closet for a couple of weeks. I just keep it in a room that is not used much. They need the change of daylight to set blossoms.
I water once a week from the bottom of the pot, it is easy to cause crown rot if over watered.
They have reached a point that they will bloom a couple of times in the winter months. It does take patience for them to bloom, it can take a few years.
I do have to say it is my favorite houseplant and I need to expand into other blossom colors.