Always best practice to change anything in pairs. Also, as a filament bulb ages, there could be a slight change in resistance, therefore to ensure equal across the circuit, change all on circuit. If nothing else (and fuse blows again), you can at least rule out bulbs as issue. While changing, also examine connectors to make sure there isn't wear that could cause a short. If this keeps happening, time to get out the multimeter...
Best wishes.
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