Not quite. They contain the same active ingredient, fluticasone, but they’re not the same inhaler. The dosage given by Flovent is measured as the amount of medication delivered from the canister in the inhaler, whereas the dosage given by Flixotide is measured as the amount of medication delivered from the mouthpiece of the inhaler.
Flovent is available in the USA but not in the UK. They’re both made by the same manufacturer though, GSK.