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@PhilDAS
They will feel different of course but I think the feel of steel is romanticised. With a carbon fork, deep wheels, high tyre pressure, it could feel very stiff.
The bigger differences will come from other things but including geometry and construction as c00ps says. A manufacturer can make a comfortable alloy frame or a stiff one using tubing shapes, tube wall thicknesses and geometry. See for example Cannondale Synapse vs Cannondale CAAD of a few years ago.
It would be difficult to compare two frame's comfort or feel unless they're very similar bikes and the material is the only difference.