{% set columns = {'fqr':'Full reference',

                  'name':'Name',

                  'type':'Type',

                  'desc':'Description',

                  } -%}

Changed features:

{% for item in columns|sort -%}{{ columns[item] }}|{%- endfor -%}

{%- for item in columns|sort -%}{{ columns[item] }}|{%- endfor %}

{% for fqr in data.sourcedata.features|sort -%}

    {%- if fqr in data.targetdata.features and not data.sourcedata.features[fqr]._compare(data.targetdata.features[fqr], columns.keys()) -%}

        {%- for colname in columns -%}

            {{- data.sourcedata.features[fqr][colname] }}| 

        {%- endfor -%}

        {%- for colname in columns -%}

            {{- data.targetdata.features[fqr][colname] }}| 

        {%- endfor %}

{% endif -%}

{%- endfor %}

Only in sourcedata:

{% for fqr in data.sourcedata.features|sort -%}

    {%- if fqr not in data.targetdata.features -%}

        {%- for colname in columns -%}

            {{ data.sourcedata.features[fqr][colname] }}| 

        {%- endfor %}

{% endif -%}

{%- endfor %}

Only in targetdata:

{% for fqr in data.targetdata.features|sort -%}

    {%- if fqr not in data.sourcedata.features -%}

        {%- for colname in columns -%}

            {{ data.targetdata.features[fqr][colname] }}| 

        {%- endfor %}

{% endif -%}

{%- endfor %}