You could manually strip out the "[tab]in use" even in Word or Textedit, but if this is something you'll do all the time, it would be better to write (or if someone here donates) a script that strips that and does that comparison.
After stripping, for the example below, only the following lines show up via 'diff', showing the new materials assigned at ID's 122 and above in one of the two files.
Note that this method doesn't show any fill associated with the material, won't tell you if someone altered the LW settings, etc.
Cheers,
Karl
125,141d124
< 122 Corner Boards 145 107 70 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wood 12:Mahogany.jpg
< 123 Driveway 192 192 192 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wall Finishes 12:Concrete 12:Concrete.JPG
< 124 Floor Finish Int 227 142 91 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Flooring 12:Parquet 12:Floorboards 2.jpg
< 125 Lake Water 173 210 201 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Landscape 12:Water 12:Water4.png
< 126 Roof 168 147 96 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Roof 12:Roof Tiles 12:Terracotta shingle.png
< 127 Roof Fascia 132 98 60
< 128 Roof Soffit 133 95 52 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wood 12:Wood 3.jpg
< 129 Stone Veneer 128 128 128 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Cultured Stones 12:CStone 44.JPG
< 130 Walls Concrete 168 169 158 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wall Finishes 12:Concrete 12:Poured concrete.jpg
< 131 Walls Ext Siding 243 240 226 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wall Finishes 12:Siding 12:Light siding.jpg
< 132 32 | Better Grass Green 0 64 0 Macintosh HD:Users:karl:Documents:Archispectives:AC Projects:Office Lib 12:Textures:grass_big_03.jpg
< 133 Walls Exterior 254 248 226 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wall Finishes 12:Render 12:Stucco.png
< 134 Walls Interior 255 255 255 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wall Finishes 12:Render 12:Stucco.png
< 135 Window Trim 133 95 52 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wood 12:Walnut.jpg
< 136 Beams 155 113 55 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wood 12:Mahogany.jpg
< 137 09 | Wd-Pine 244 206 136 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Wood 12:Wood Grain pine alpha.png
< 138 32 | Earth scaleable 148 104 75 Macintosh HD:Applications:Graphisoft:ArchiCAD 12:ArchiCAD Library 12:[TImg] Textures 12:Flooring 12:Hard Surfaces 12:Earth alpha.png
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AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB