I dont think you can change the spells in the sequencer without using the one you've made and re-casting another sequencer.
On contingencies you can change the spells loaded up by clicking on a button at the bottom of the screen in your spellbook (like shamrock said) but im not sure if this simply replaces the chosen spells or recasts a new contingency - hence using another 6th lvl spell (for contingency) or 9th lvl spell (for chain contingency)
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