The chat template appears very similar to the one used in H4 Zephyr (and later also in stablelm zephyr) but with minor differences (mostly about eos_token).
Are those differences intentional?

Just to make the differences easier to see:

Zephyr

{% for message in messages %}
    {% if message['role'] == 'user' %}
        {{ '<|user|> ' + message['content'] + eos_token }}
    {% elif message['role'] == 'system' %}
        {{ '<|system|> ' + message['content'] + eos_token }}
    {% elif message['role'] == 'assistant' %}
        {{ '<|assistant|> ' + message['content'] + eos_token }}
    {% endif %}
    
    {% if loop.last and add_generation_prompt %}
        {{ '<|assistant|>' }}
    {% endif %}
{% endfor %}

OLMoE

{{ bos_token }}
{% for message in messages %}
    {% if message['role'] == 'system' %}
        {{ '<|system|> ' + message['content'] }}
    {% elif message['role'] == 'user' %}
        {{ '<|user|> ' + message['content'] }}
    {% elif message['role'] == 'assistant' %}
        {{ '<|assistant|> ' + message['content'] + eos_token }}
    {% endif %}
    
    {% if loop.last and add_generation_prompt %}
        {{ '<|assistant|>' }}
    {% endif %}
{% endfor %}