They are not exactly the same. There is a very small rounding error:

#!/usr/bin/perl
use strict;
use warnings;

my $base = 0.0425;

while ( my $line = <DATA>){
  chomp $line;
  my ($z,$c1,$c2,$c3,$c4) = split(/,/,$line);
  print join("|",$z,$c1,$c2,$c3,$c4),"\n";
  my $total = $c1+$c2+$c3;
  print $c4  == ($total + $base) ? "True\n" : "False ".
    sprintf("%20.18f",$c4)." != ".
    sprintf("%20.18f",($total+$base))."\n";

}
__DATA__
00501,0.0000,0.0425,0.0025,0.0875
00544,0.0000,0.0425,0.0025,0.0875
06390,0.0000,0.0425,0.0025,0.0875
[download]

output:

00501|0.0000|0.0425|0.0025|0.0875
False 0.087499999999999994 != 0.087500000000000008
00544|0.0000|0.0425|0.0025|0.0875
False 0.087499999999999994 != 0.087500000000000008
06390|0.0000|0.0425|0.0025|0.0875
False 0.087499999999999994 != 0.087500000000000008
[download]