How to avoid calling content when two tags are partially the same in Shopify - shopify

Question

I am currently trying to display content based on product tags that are assigned to products in Shopify.
This is working ok, but my problem is that I have two tags that contain partially the same tag name, so I am getting both sets of content appearing on the front end.
One tag shows a field that is required "r-[tag-name]" and the other shows the same field but it is not required "[tag-name]".
Obviously I know this is due to the fact that I am using 'contains' so the logic is true for both when either tag is applied, but I have tried using '==' (equals) but it when I do, nothing appears at all :/
What I would like to know is, what do I need to change so that the statement is only true if a tag exists that is exactly the same as the if statement.
I am new to Liquid so any help would be greatly appreciated!
<!--Convert the tags into a string by joining them with COMMA-->
{% assign productTags = product.tags | join: ', ' %}
<!--Now Check for the desired tag name-->
{% if productTags contains 'r-custom-name-one' %}
<p class="line-item-property__field">
<label for="name-one">Name One:</label>
<input class="required" id="name-one" type="text" name="properties[Name One]">
</p>
{% endif %}
{% if productTags contains 'custom-name-one' %}
<p class="line-item-property__field">
<label for="name-one">Name One:</label>
<input id="name-one" type="text" name="properties[Name One]">
</p>
{% endif %}

Answer 1

I need to change so that the statement is only true if a tag exists that is exactly the same as the if statement
This should do it:
{% for tag in product.tags %}
{% if tag == 'r-custom-name-one' %}
<p class="line-item-property__field">
<label for="name-one">Name One:</label>
<input class="required" id="name-one" type="text" name="properties[Name One]">
</p>
{% break %}
{% endif %}
{% if tag == 'custom-name-one' %}
<p class="line-item-property__field">
<label for="name-one">Name One:</label>
<input id="name-one" type="text" name="properties[Name One]">
</p>
{% break %}
{% endif %}
{% endfor %}
I added {% break %} which will
Causes the loop to stop iterating when it encounters the break tag.
I assumed that once the tag is found, you don't need need to continue looping through the rest of the tags!