Welcome back! No, sorry you are here sounds more appropriate.
Short answer to your question; SRT is the same as RT. Slightly longer answer is that it depend.
A slowly rising PSA from a low value post RP suggests a small number of cells in the prostate bed. Ideally you will get some scans done, but at low PSA levels they may not show anything, and you may decide to just shoot blind, or wait until the scan shows a definite target. The oncologist is the best person to make that decision.
Usually RT is 37 fractions, but this has been reduced lately. As most of the cancer has been removed, it may be only a small number of fractions for you OH, as few as five. HT is usually two years, but with SRT it may not be required at all or could be just 6 months.
So the long answer is SRT is more or less the same as RT, but will probably be a little less intense.
Getting booked in for some scans is hopefully the next move.