The short answer is, No.
The names aren't as important as the equations.
Dirichlet: f(x=a)=A
Neumann: df/dx(x=a)=A
Convective: df/dx(x=a)+f(x=a)=A
So convective boundary conditions are, in fact, what are known as Robin boundary conditions.
If A≠0, these are ``inhomogeneous'', so a change of variables is necessary to map them to homogeneous boundary conditions.
Well, the answer is No.
The convective boundary conditions are not classified as Neumann boundary conditions. They describe the transfer of heat or mass through a boundary due to the fluid flow and are therefore classified as Robin boundary conditions.
In contrast, Neumann boundary conditions describe the flux or gradient of a quantity perpendicular to the boundary.
I think from the answers that the topic requires some details.
If you write a scalar equation in the normal direction to the outflow, you can write approximately something like (d/dt +vn*d/dn) f= d/dn(alpha*df/dn).
Setting to zero the diffusive flux in the RHS is equivalent to prescribe a homogeneous Neumann BC and produces a convective-like BC.
This approach is largely used, for example in Fluent.
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