No, stamps on letters can be quite different, they differ in two main ways, the value of the stamp, each value may be a different colour and/or design, and the country producing the stamps will have it's own unique design from others countries.
do you need airmail stamps put on letters from australia to england
no reason
yes
Yes, they will exchange damaged stamps for similar stamps. They will not give you back you money.
Yes
it is the collection of stamps & used in posting letters.
Yes, they needed them for letters.
no u cant.!
I mail my letters with 5 cent stamps from the 60's.
Yes, first-class stamps are always valid for mailing letters within the same country, regardless of when they were purchased. However, the cost of postage may increase over time, so additional stamps may be required if the postage rate has gone up since the stamps were purchased.
Yes, you can use regular stamps on first class mail. Most letters that you would mail only take one or two stamps.
At the post office. Order them online.