Are there differences in tool standards between aircraft manufacturers?
According to a friend of mine that has worked as an aircraft mechanic for the last 30 years or so, it depends on the manufacturer.  For example:


American made aircraft, including Boeing, use SAE sized tools (US standard sizes)
Airbus uses metric tools
Hawker uses British Standard Whitworth tools
Dassault Falcon uses (believe it or not) a combination of SAE and metric.
Bombardier uses SAE