tk 8.5 vs 8.4: "font actual" differences

Could someone tell why on the very same system "font actual" gives
different results in 8.5 and 8.4:

% info patchlevel
8.4.14
% font actual {Helvetica 8}
-family helvetica -size 8 -weight normal -slant roman -underline 0 -overstrike 0

% info patchlevel
8.5.1
% font actual {Helvetica 8}
-family {Nimbus Sans L} -size 8 -weight normal -slant roman -underline 0 -overstrike 0

What is the magic behind using {Nimbus Sans L} in 8.5?

This makes a difference when generating Postscript output, where
suddenly instead of 'Helvetica' 'Nimbus Sans L' is requested.
The result is that my printer (HP LaserJet with PostScript engine)
substitutes a fixed width font instead of Helvetica :-/

% canvas .c
.c
% pack .c
% .c create text 10 10 -font {Helvetica 8} -text foo
1
% .c postscript -file foo.ps
% lp foo.ps
=> prints with Helvetica in 8.4
=> prints with Courier (?) in 8.5

Thanks
R'
.

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