Filters in DF1

Hello,
I am trying to use some ready microcode on my DSP for filter but results
for eg Highpass filter differ . Manual says

>  For these architectures (e.g. Blackfin and Coldfire), a better approach
> is to implement those
> functions as direct form I (DF1), which is easier to express in terms of
> MAC. When doing that however, it is important to
> make sure that the DF1 implementation still behaves like the original DF2T
> behaviour when it comes to filter values.
> This is necessary because the filter is time-varrying and must compute
> exactly the same value (not countingmachine rounding)
> on any encoder or decoder.

However floating point differs from fixed . Should results be identical ?

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