Not quite, perdone is a verb in the imperative, as in "Pardon me", whereas perdón is a noun, as in "I beg your pardon" I guess.
Usage wise, yes, they're interchangeable, but with perdone you have to bear in mind whether you are addressing one or several people, formally or informally, and use perdone/perdona/perdonen/perdonad accordingly.
To turn a Spanish third person formal and singular verb (whose infinitive ends in -ar) into a command, the "-a" gets changed into a "-e.""Perdone" is the command form of the verb "perdonar." For this reason, the Spanish sentence is odd because it's a request that is simultaneously a command.
In English, this is a grammatical formality and "Pardon me, sir ... " is allowable, but is it a grammatical formality in Spanish or is it bad Spanish syntax?
"A qué hora…" is "[at] what time…?". You use the a when you want to know what time 'someone does something' or what time 'something happens/does something'. For ex: "What time does the bus leave?" = ¿A qué hora sale el autobús? You may notice that to answer this question, you'll also use the preposition
a: *El autobús sale
a la una/
a las dos (etc.)"
• ¿Qué hora
Es la una/
Son las dos/etc. (What time
is it? --> It
is one o'clock/It'
s two o'clock/etc.)
A qué hora sale el autobús? --> El autobús sale
a las dos ([At] What time does the bus leave? --> The bus leaves
Our college teacher taught us to say "Que' hora son?". That "son" was more common than "es". I guess it varies by location as to which is more typically used. My high school teacher (50 years ago) taught me to say "Que' hora es?". So which is more typically used in Mexico and does it depend on where in Mexico? And if you think it is close to 1:00 would "es" be preferred over "son"? Just curios.
It would have to be '¿Qué horas son': the noun has to be plural, like the verb.
The Universidad de Piura's Castellano Actual says:
Yo puedo preguntar ¿qué hora es? o ¿qué horas son? [...] Si bien, la última forma se siente coloquial
And the DPD entry for hora has;
Su formulación en plural (¿Qué horas son?) es admisible, aunque menos recomendable, y se da con cierta frecuencia en algunos países de América, especialmente en el nivel popular